Primers for 7mm Rem Mag

[auton]

I suggest The Federal 215GM Match primer...excellent with
160 TSX and Reloader 25 @ 70.0.

If it is a mag rifle use Mag primers....certain with large powder loads like the 7mm Mag and slow powders.

[D.P.]

I think you answered your own question. Keep good noted for the future I see a trend with my rifles. Often 215 or cci mags shoot similar with slower powders.(for me) Several of my rifles shoot best with CCI Mags when I used R-22. Dont write off a load until you try different primers as you saw with the 210's. When I get a good load and tune seating depth the last thing I do is swap primers and see if any tighten it up more or drop SD. Take it for what its worth, some people will tell you what to use (which will often be correct or put you in the righ direction) In the end the rifle will tell you what to use.
I had a .257 Roberts that just would not shoot. I did some testing and in the end R-22 and CCIM primers turned it into a 1/2 moa gun out to 400 yards [img]/ubbthreads/images/graemlins/confused.gif[/img]